Morphological and ontogenetic stratification of abyssal and hadal Eurythenes gryllus sensu lato (Amphipoda: Lysianassoidea) from the Peru-Chile Trench
Morphological and ontogenetic stratification of abyssal and hadal Eurythenes gryllus sensu lato (Amphipoda: Lysianassoidea) from the Peru-Chile Trench
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DOI：
10.1016/j.dsr.2015.11.005
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发表时间：
2016-03-01
影响因子：
2.4
通讯作者：
Jamieson, Alan J.
中科院分区：
文献类型：
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作者：
Eustace, Ryan M.;Ritchie, Heather;Jamieson, Alan J.
全球普遍存在的lysianassoid端足类，Eurythenes gryllus，已被证明是由多个遗传上不同的神秘类群，深度被认为是物种形成和形态分化的主要驱动力。在这里，我们研究形态变异E。在秘鲁-智利海沟（东南太平洋），gryllus sensu lato通过从深海（3000-6000米）到超深海（> 6000米）的连续深度分布。鉴定出三种不同的形态种：一种被确认为E. magellanicus（4602-5329 m）的DNA序列和形态相似性。其他两个形态上不同的物种是根据出现的深度命名的：深海（4602-6173米）和Hadal（6173-8074米）。这三个Eurythenes形态种垂直个体发育分层在其测深范围内，青少年被发现在其深度范围较浅，成熟的女性更深。潜在的生态和进化的驱动因素，解释所观察到的模式内和种间结构，如静水压力和地形隔离，进行了讨论。(C)2016爱思唯尔有限公司版权所有
The globally ubiquitous lysianassoid amphipod, Eurythenes gryllus, has been shown to consist of multiple genetically distinct cryptic taxa, with depth considered a major driver of speciation and morphological divergence. Here we examine morphological variation of E. gryllus sensu lato through a continuous depth distribution that spans from abyssal (3000-6000 m) into hadal depths (> 6000 m) in the Peru-Chile Trench (SE Pacific Ocean). Three distinct morphospecies were identified: one was confirmed as being E. magellanicus (4602-5329 m) based on DNA sequence and morphological similarity. The other two morphologically distinct species were named based upon depth of occurrence; Abyssal (4602-6173 m) and Hadal (6173-8074 m). The three Eurythenes morphospecies showed vertical ontogenetic stratification across their bathymetric range, where juveniles were found shallower in their depth range and mature females deeper. Potential ecological and evolutionary drivers that explain the observed patterns of intra and inter-specific structure, such as hydrostatic pressure and topographical isolation, are discussed. (C) 2016 Elsevier Ltd. All rights reserved.